Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 74 · 40 questions

The trick (Last digits only): Multiply (or add) only the last digits of the two numbers. The last digit of that result is the last digit the answer must have. Different last digit → wrong for sure. Same last digit → it passes the check (work it out in full to be certain).

1. 1.Last-digit check: is 389 + 180 = 569 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 631 + 448 = 1079 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 38 × 24 = 910 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 14 × 45 = 630 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 40 × 41 = 1640 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 264 + 251 = 515 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 96 × 97 = 9311 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 638 + 224 = 871 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 20 × 39 = 780 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 585 + 973 = 1558 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 73 × 44 = 3220 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 85 × 59 = 5015 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 801 + 745 = 1546 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 825 + 976 = 1801 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 478 + 482 = 960 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 18 × 27 = 479 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 93 × 43 = 3999 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 84 × 39 = 3276 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 227 + 485 = 721 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 590 + 552 = 1142 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 432 + 787 = 1211 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 443 + 335 = 778 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 312 + 904 = 1216 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 460 + 850 = 1308 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 522 + 683 = 1205 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 13 × 92 = 1196 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 52 × 82 = 4264 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 41 × 35 = 1434 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 12 × 68 = 816 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 37 × 43 = 1591 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 53 × 61 = 3237 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 43 × 89 = 3827 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 367 + 863 = 1230 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 449 + 492 = 941 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 88 × 95 = 8354 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 95 × 27 = 2565 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 337 + 604 = 941 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 589 + 781 = 1370 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 347 + 209 = 562 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 484 + 192 = 673 right or wrong? (a) Wrong (b) Right

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